2) A student tried to make a thermodynamically spontaneous cell at 298 K composed of 100. mL of 1.00 M Mg2+ (aq) in one beaker with a magnesium electrode and 100. mL of 1.00 M Al3+ (aq) in another beaker with an aluminum electrode. The beakers are connected with a porous disc and the electrodes are
connected with a wire connected to a voltmeter:
Al3+ (aq) + Mgs → Mg2+ (aq) + Al(s) E° = +0.71 V
The student ran out of magnesium nitrate and could only make 100. mL of a Mg2+ solution with a
concentration of 0.75 M. What effect, if any, will this have on their cell potential? Explain.

"among the transition metal elements, manganese and zinc have a slight lowering of electronegativities. the reason behind this is that the nuclear charges of these elements are slightly weaker than the other transition metal elements due to the way their valence electrons are filled up. both manganese and zinc have their valence electrons filled up to the 4th shell with 1 pair of electrons (4s2) completely occupying it. although the electrons in the 3rd shell (3d) are yet to be paired since the outer most shell is filled up, the ability of the nucleus to attract electrons is lessened. hence,   the electronegativity (or the ability to attract electrons) is lessened."

the answer would be a